Micellar systems in flow injection for the spectrophotometric determination of neodymium in glasses

Abstract

Neodymium (0.03–21 µg ml^–1) can be determined at a sampling rate of 120 h^–1 by injection at pH 2.7 in the presence of 0.4 M NaNO₃ into a carrier containing 1.6 × 10^–3M 1-(2-pyridylazo)-2-naphthol (PAN)(0.15 g of Triton X-100 plus 1 mg of PAN) buffered at pH 9.2 [HBO₂+ NaBO₂(0.04 M)] and monitoring the absorbance at 560 nm. The influence of the presence of electrolytes in the matrix on peak height was studied. The interferences produced by heavy metals were eliminated by extracting their diethyldithiocarbamates into chloroform-ethyl actate (1 + 1). The method was applied to the determination of Nd in a commercial glass.